MX2012004979A - Method of control signaling in a wireless communication system. - Google Patents

Abstract

A method for Fixed Network Equipment (FNE) to control the three of four and one of four slow associated control channel (SACCH) pattern on an Association of Public-Safety Communications Officials (APCO) Project 25 (P25) trunked voice channel is provided. Knowledge of this pattern by both the FNE and radio allows for unique information to be signaled in each type of SACCH. According to some embodiments, an operation enables controlling the floor (inbound) while there is an independent outbound (floor) (e.g. Console takeover). The provided operation also allows each radio to differentiate inbound floor control signaling from outbound caller identification (ID). Having the infrastructure control the inbound SACCH pattern and communicate this to all radios, makes the correct detection of the transmitted pattern from the radio more reliable.

Description

METHOD FOR CONTROLLING THE SENDING OF SIGNALS IN THE SYSTEM OF WIRELESS COMMUNICATION FIELD OF THE INVENTION The present invention relates, in a general way, to wireless communication and, more particularly, to a method that allows controlling the sending of signals to a group of wireless communication devices connected in a "push to talk" or "push to talk" type communication. one way in a wireless communication system.

BACKGROUND OF THE INVENTION As public safety agencies are evaluating their future two-way radio communication needs, many are coming to similar conclusions: the radio spectrum is becoming increasingly congested and regulatory entities are asking that public safety do more with less; the demand for data transmission is increasingly pronounced and, often, inaccessible in narrow-band systems, systems need more functionality, secure communication is a growing need and an improvement in the quality of digital voice is essential in a growing area of coverage.

SIMÓN DE LA I VENCIÓN It should be noted that making an improvement in a communication network is a large task in terms of time, energy and expenditure. There are a variety of possible solutions, including digital technologies currently available.

Project 25 (P25) of the Association of Communications Officials in Public Safety (APCO) is an initiative at an industrial level with a view to the establishment of recommended voluntary norms of digital two-way uniform radiotechnology for public safety organizations. If you wish to have a copy of the APCO Project 25 Declaration of Requirements go to the site: http: // www. apcoin l. org / frequency / project25 / documents / SOR-2008. pdf. The main objectives include: providing an increase in functionality with equipment and capabilities aimed at public security needs; improve spectrum efficiency; ensure competition between different providers through the architecture of open systems, and allow efficient, effective and reliable communications between agencies and within them.

An important aspect of any wireless communication standard is the provision of a mechanism for sending signals with the control information to the two radios, the transmitter and the receiver, that is, the radio transmitter and the radio receiver. For example, within the scope of the Project 25 standard of the APCO, control signals control aspects such as: the display of the identification (ID) of the incoming call on the receiving radios; the confirmation of the transmission capacity of the radio transmitter and the capacity of the fixed equipment of the network or FNE, acronym of "Fixed Network Equipment", to determine which radio is currently transmitting on the channel.

Accordingly, it is desirable to accurately detect the incoming control information. Additionally, there is a need for a reliable method to accurately determine the time at which a radio transmitter is receiving outgoing control signals and also to accurately send the ID signals of the incoming call and the transmitter control information to the radios. transmitters within a wireless communication system.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, in which like reference numerals refer to identical or similarly functioning elements in all separate views, together with the following detailed description are incorporated in this specification forming part of it and serve to further illustrate the modalities of the concepts that include the claimed invention and explain various principles and advantages of said modalities.

Figure 1 illustrates a communication system in which various modalities can be implemented.

Figure 2 is a flow chart illustrating a normal call operation method initiated by radio, in accordance with some modalities.

Figure 3 is a flow chart illustrating a normal call operation method initiated in the console, in accordance with some embodiments.

Figure 4 is a flow diagram illustrating a console delivery method, in accordance with some embodiments.

Figure 5 is a flow chart illustrating a radio delivery method, in accordance with some embodiments.

Figure 6 is a flow chart illustrating a method for resumption of the radio, in accordance with some modalities.

Figure 7 is a flow diagram illustrating a method of radio-to-radio audio interruption at different sites, in accordance with some embodiments.

Figure 8 is a flow diagram illustrating a method of radio-to-radio audio interruption at the same site, in accordance with some embodiments.

Figure 9 illustrates the sending of random access control signals of the voice channel, in accordance with some modalities.

Those who have experience in the technique will realize that the elements of the figures are illustrated by simplicity and clarity and that they have not, necessarily, been drawn to scale. For example, the dimensions of some of the elements of the figures may have been exaggerated with respect to other elements in order to improve the understanding of the embodiments of the present invention.

Where deemed appropriate, the components of the method and the apparatus are represented in the drawings by means of conventional symbols, only those specific details being shown which are relevant to understand the embodiments of the present invention, so as not to complicate the description in detail. which will be totally evident to those who have ordinary experience in the technique and have the benefit of this description.

DETAILED DESCRIPTION OF THE INVENTION According to some embodiments, the present invention includes a method for fixed network equipment or FNE ("Fixed Network Equipment") to control 3/4 and 1/4 of the associated slow control channel pattern or SACCH, acronym for "Slow Associated Control Channel", on a voice channel with connection P25. That this pattern is of knowledge of both the FNE and the radio allows unique information to be sent as a signal in each type of SACCH. According to some modalities, an operation allows controlling the floor (incoming) as long as there is an independent projection (floor) (for example, console delivery). The operation provided also allows each radio to distinguish the incoming floor control signals from the identification (ID) of the incoming call. Having the infrastructure controls the pattern of the incoming SACCH and communicating it to all the radios, makes the correct detection of the transmitted pattern of the radio more reliable.

Figure 1 illustrates a wireless communication system 100 in which various embodiments of the present invention can be implemented. The wireless communication system 100 comprises a plurality of communication devices, such as the illustrated radios 102, 103 and 104, which may be, for example, a mobile or portable radio, a personal digital assistant, a cellular telephone, a mobile terminal, video, a laptop with wireless modem or any other wireless communication device. For the purposes of the following descriptions, the communication devices will be referred to indistinctly as "radios" or "subscriber units", although in the art they are also referred to as: mobile stations, mobile equipment, handheld devices, mobile subscribers or uses some other equivalent term.

For example, as illustrated, the radios 102, 103 and 104 communicate in a radio access network 106. Those of ordinary skill in the art will realize that any type of wireless communication network is within the scope of the teachings herein. In this way, the radio access network 106 may comprise infrastructure such as, for example, but not limited to: base stations or BS (acronym in English for "Base Station") (for clarity, only one BS 108 is shown), BS controllers (not shown) network elements (such as, for example, a mobile switching center, a resident location record, a visitor location record, a tie-in resource controller, a console operator's position, etc.) and the like, in order to facilitate communications between the radios that have access to the radio access network 106. Those of skill in the art will realize that other radio access networks ((not shown) will also be able to connect to the radio access network 106 to enable communication in wider areas covered by multiple radio access networks .

For example, radios 102 and 103 and radius 104 may communicate with each other through BS 108. As is known to anyone of ordinary skill in the art, BS 108 generally comprises one or more devices repeaters that can receive a signal coming from a radio transmitter through a wireless link and retransmit it to the radios that are listening (listening radios) through different wireless links. For example, the radio 102 can transmit to the BS 108 through the link 110 and the BS 108 can retransmit the signal to the listening radios 103 and 104 through, respectively, the wireless linksll4 and 112. The BS 108 can also receive a signal from the radio 103 through the wireless link 114 and retransmit the signal towards the radios 102 and 104 through the wireless links 110 and 112, respectively. Alternatively, the BS 108 may receive a signal from the radio 104 through the wireless link 112 and retransmit said signal to the radios 102 and 103 through, respectively, the wireless links 110 and 114. For ease of illustration, only They show three radios and one BS. However, those of ordinary skill in the art will realize that in a typical system, a radio network can include any number of radios, any number of base stations, any number of base controllers and any number of network elements. On the other hand, although in this embodiment it is shown that the communication between radios 102, 103 and 104 is facilitated by the BS 108, the radii 102, 103 and 104 can communicate using a direct mode of operation without using a BS. The teachings of the present are equally applicable to the operation in direct mode between two radios.

Since the network 106 is a wireless network, which means that it supports a wireless interface protocol or by air for the transmission of signals, the radios 102, 013 and 104 and BS 108 comprise transceivers that include a transmitter and a receiver for, respectively, transmitting and receiving radio frequency (RF) signals. Additionally, radios 102, 103 and 104 and BS 108 comprise one or more processing devices (such as microprocessors, digital signal processors, custom processors, field programmable gate arrays or FPGAs). ), stored program unique instructions (that include so much software as firmware), state machines and the similar thing) and, normally, a conventional memory element so that it executes (among other functionalities) the protocol of aerial interface and the access scheme to the channel supported by the network 106. Thanks to the use of these protocols, each of the radios 102, 103 and 104 can generate RF signals containing one or more data messages comprising a plurality of fields to organize the continuous bits of information and / or signals for transmission to another radio.

Although, with respect to Figure 1, one modality of a communication system 100 is described, those who are experienced in the art will realize that the specifications of this illustrative example are not the specifications of the description itself and that The teachings discussed here can be applied to a variety of alternative configurations. For example, because the teachings described do not depend on the type of air interface protocol or channel access scheme used (for example, time division multiple access (TDMA), multiple access per code division (CDMA), frequency division multiple access (FDMA) and the like), the lessons can be applied to any type of air interface protocol and access scheme to channel. The teachings herein can also be applied to any system and to any protocol that uses wired links, ie wired. In this way, alternative implementations using different types of wired or wireless protocols and channel access schemes are considered and are within the scope of the various teachings described.

The medium access control (MAC) standard phase 2 of the P25 defines a voice channel (VCH, for short as "Voice CHannel") as a bidirectional channel, which is used to exchange blocks of speech and signals between the FNE and one or several subscriber units or SU, abbreviations in English of "Subscriber Units". A VCH may be associated with a group communication, a half-duplex individual call, a half-duplex telephone interconnection call or a single time division duplex call, which includes a telephone interconnection call. A VCH is composed of transit time slots (voice + signals) or the associated fast control channel or FACCH (short for "Fast Associated Control CHannel") followed by a time slot with signals from the associated slow control channel (SACCH).

The MAC phase 2 standard of P25 defines an associated fast control channel (FACCH) as a signal channel using slots normally assigned to the voice in the voice channel (VCH). The FACCH is normally used for call setup, pause time and interruption signals.

Additionally, the phase 2 MAC standard of P25 defines an associated slow control channel (SACCH) as a periodic bidirectional logical channel in the VCH, which is used to exchange signals or data information between the fixed network equipment (FNE) and a or several subscriber units (SU) assigned to the corresponding logical voice channel. An outgoing SACCH is used to transport broadcast information signals to the receiving radios, such as a call-specific signal, which includes call grants and information related to users of the current channel and information of the current type of call over other calls active devices that allow the operation of scanning or radio scanning, messaging signals to take individual users out of their call and sending signals to transmitting radios, such as, for example, power control signals and transmitter shutdown signals. An input SACCH is used to carry specific call signals, which includes information related to current users of the channel and the current call type, call interruption requests from listener radios and call continuation requests during the pause time. Every twelve slots there is an SACCH per logical voice channel, which is commonly known as a superframe.

All receiving units know the location of a SACCH burst within a superframe. The SACCH burst carries the SYNC at the input. The burst of the SACCH can be mixed or not. To distinguish between a mixed SACCH and an unmixed SACCH, the identifier of the data unit or DUED, which stands for "Data thit Identifier", is used.

The SACCH signals have a specific pattern (3 of 4 SACCH for sending signals to the radio receiver and 1 of 4 for outgoing messages to the radio transmitter). The present invention allows the FNE to control the SACCH pattern of 3 of 4 and 1 of 4. This information is sent as a signal to the radios, before and during the active call, in order to supply which are the specific SACCH positions 3 of 4 and which is 1 of 4 (sent as a signal in the signal channel between slots or ISCH, acronym of "Inter-slot Signaling CHannel"). This solution allows operations and processes that determine what individual identification information (ID) should be transmitted in positions 3 of 4, 1 of 4 and how the radio should apply this information.

The signals from the output SACCH include: • Random access or RA SACCH signals (by "Random Access") - Transmitter radio control signals (1 of 4 SACCH) - MAC_ACTIVE (user of the ¾oz gripal channel or GVCU by "Group Voice Channel User"), MAC_RELEASE .

• SACCH signals of non-random access or non-RA - SACCH signals of general call information (3 of 4 SACCH) - This could be GVCU with call controller, priority monitor, adjacent status broadcast.

The input SACCH signals (determined by F-bit (receivers) and the SACCH pattern (transmitters) include: • RA SACCH signals - Listening radio signals.

• SACCH signals not RA - Signals of the radio transmitter (GVCU) The exit ID signals include: • On the non-transmitting radio site, call controller ID on a non-RA SACCH, ID 0 on the RA SACCH.

• At the site of the radio transmitter, ID of the call controller in a non-RA SACCH, ID of the transmitting radio in the RA SACCH.

The MAC phase 2 standard of the P25 defines an ISCH as a logical channel that is located between two (2) consecutive output slots of a physical channel. It is sized to occupy the reserved space in the entry path for the increase or decrease, the pilot sequences (at the beginning and end of the burst) and the guard time. This logical ISCH is composed of 40 consecutive bits (consisting of the 20 bits at the end of an output slot and the 20 bits at the beginning of the next output slot).

There are two types of logical ISCHs. The first type of ISCH, the S-ISCH, contains a 40-bit synchronization sequence. The second type of ISCH, the I-ISCH, contains a 40-bit modulated information sequence that provides six bits of information after decoding the 40 bits in the MAC layer.

An ultraframe is a set of four consecutive superframes of 360 milliseconds (ms) comprising a time interval of 1.44 seconds. A superframe is a set of 2 * 6 time slots of 30 ms each for two-slot TDMA, that is, 360 ms. The last two time slots are inverted signal slots. The subscribers that transmit use the SACCH of the first three superframes of the ultraframe to send the information of the signals to the FNE and listen to the information of the FNE in the SACCH output of the fourth superframe. The structure of the ultraframe has signals in the I-ISCH field and, optionally, can be determined, for example, by processing the information within a SYNC_BCST message of the APCO project 25 in the control channel.

In an ultraframe controlled by a fixed network equipment (FNE), the FNE determines the specific location of a random access SACCH. The location of the SACCH slots can be determined in systems that synchronize the FDMA control channel and the TDMA transit channels, by the synchronization message of the control channel and, optionally, in the I-ISCH. In the case of systems that do not synchronize the FDMA control channel and the TDMA transit channels, the location of the SACCH can be determined in the I-ISCH. The availability of the input SACCH location is indicated in the I-ISCH that precedes the specific input SACCH.

In a radiofrequency (RF) site with at least one radio transmitter, 1 of 4 input SACCH positions are available for random access. In an RF site without radio transmitter, 4 out of 4 input SACCH positions are available for random access.

The operation of the radio receiver includes determining the availability of the input SACCH from the signals of the I-ISCH (F-bit). The synchronized radios determine 1 of 4 of the random access SACCH pattern from the synchronization broadcast message received in the control channel. Non-synchronized radios determine 1 of 4 of the random access SACCH pattern from the I-ISCHs.

The basic ID control information for the receiving radios includes: • SACCH non RA - information used to update the incoming call ID.

• RA SACCH - the information indicates the presence of a radio transmitter in the channel.

The basic ID control information for transmitting radios includes: • SACCH not RA - not accessible.

• RA SACCH - information used to control the ability to continue the transmission. o If the user of the group voice channel (GVCU) in the SACCH of RA = ID of the radio transmitter, the radio continues transmitting. o If the ID of the GVCU in the SACCH of RA < > ID of the radio transmitter, the radio transmitter is disconnected. o If the ID of the GVCU in the SACCH of RA = 0, the radio waits for the following signals from the SACCH RA. o If many consecutive SACCH IDs of RA = 0, the radius is disconnected, o If many consecutive messages from the RA SACCH can not be validly decoded, the radio is disconnected, o If the MAC_RELEASE message is received together with the radio ID, the radio is switched off.

As previously described herein, in accordance with some modalities, the sending of individual signals in the GVCU is provided here. Figures 2 to 8 are flow diagrams illustrating the operation of the various devices within a wireless communication network in accordance with various modalities.

Referring now to Figure 2, normal call operation 200 initiated by radio is illustrated, in accordance with some embodiments. As illustrated, the operation begins in step 205 with a call granting in which an individual ID is established. Next, in step 210, the individual ID of the call granting is initially used for sending signals to the GVCU. Next, in step 215, it is determined whether a source site is sending a GVCU message in the SACCH. In step 220, when a source site is sending a GVCU message in the SACCH, at the originating site, 4 of the 4 SACCHs include the radio ID in the GVCU.

When a source site is not sending a GVCU message, the operation proceeds to step 225, in which it is determined whether a destination site is sending a GVCU message. When no destination site is sending GVCU messages, the operation ends. When a destination site is sending a GVCU message in the SACCH, the operation proceeds to step 230, in which 3 out of 4 SACCHs include the radio ID in the GVCU of the SACCH. Next, in step 235, 1 of 4 SACCHs includes an ID = 0 in the GVCU of the SACCH.

Next and after step 220, in step 240, the ID is updated based on the audio plane signals sent from the radio transmitter. Then, in step 245, it is periodically determined whether the radio is disconnected. When the radio is disconnected, the operation proceeds to step 250, in which the transmitting radio ID is set to 0 at the radio transmitter site.

Figure 3 is a flow chart illustrating a normal call operation 300 initiated in the console, in accordance with some embodiments. As illustrated, the operation begins at step 305 with a call grant, in which an individual ID is established. Next, in step 310, the individual ID of the call granting is initially used for the sending of signals to the GVCU. Now, in step 315, it is determined if a destination site is sending a GVCU message in the SACCH. When no destination site is sending any GVCU message, the operation ends. When a destination site is sending a GVCU message in the SACCH, the operation continues in step 320, in which 3 of 4 SACCHs include the radio ID in the GVCU of the SACCH. Next, in step 325, 1 of 4 SACCHs includes an ID = 0 in the GVCU of the SACCH. Next, in step 330, the ID is updated based on the audio plane signals sent by the transmission console.

Figure 4 is a flow diagram illustrating a console delivery operation 400, in accordance with some embodiments. As illustrated, the operation begins at step 405 with a radio transmission. Now, in step 410, all the GVCUs of the SACCHs include the ID of the transmitting radio in the GVCU messages of the radio transmitter site. In step 415, the ID = 0 at the destination sites of the random access (SAC) SACCH GVCU. Then, in step 420, the console connects and the delivery of the call granting would indicate that the console was transmitting. Next, in step 425, the delivery ID of the call grant is used to populate or fill each GVCU message in 3 of 4 SACCH signals at each originating and destination site. Now, in step 430, the previously used radio ID will be transmitted in the GVCU of the RA SACCH at the radio transmitter site (note that ID = 0 is used at the destination sites). Next, in step 435, it is determined whether the radio transmitter was disconnected during the delivery of the console. When the radio transmitter has not been disconnected, the operation ends. When the radio transmitter has been disconnected, the operation advances to step 440, in which the radio site that previously was transmitting establishes the ID = 0 in the GVCU of the RA SACCH.

Figure 5 is a flow chart illustrating an operation of the radio jack 500 in accordance with some embodiments. As illustrated, the operation begins at step 505, in which a console is transmitting. Next, in step 510, the non-RA SACCHs include the console ID in the GVCU messages. Next, in step 515, each RA SACCH includes an ID = 0 in the GVCU of the RA SACCH. Now, in step 520, a radio is connected to the control channel. In response, in step 525, each RA SACCH at the radio transmitter site is updated with the radio ID of the GVCU of the RA SACCH as indicated in the call grant. In step 530, an ID = 0 is used at the destination sites. Next, in step 535, the radio is connected to the voice channel.

Figure 6 is a flowchart illustrating a method for the resumption 600 of the radius, in accordance with some embodiments. As illustrated, the operation begins at step 605, in which a console and a radio are transmitting both. As shown in step 610, each non-RA SACCH includes the console ID in the GVCU of the SACCH and, as shown in step 615, each RA SACCH includes the radio ID in the GVCU of the SACCH of Ra in the transmitter site. When the console is disconnected, in step 620, the operation proceeds to step 625, in which the acknowledgment signals indicate that the radio is the origin of a call with the radio ID. Now, in step 630, the GVCU messages are updated based on the call granting ID, so that each GVCU of the non-RA SACCH and the RA SACCH includes the ID of the transmitting radio at the radio transmitter site (ID = 0 in each destination site).

Figure 7 is a flow chart illustrating a method for interrupting the radio-to-radio audio at different sites 700, in accordance with some embodiments. As illustrated, the operation begins in step 705, in which a site 1, radio 1 is transmitting. It will be noted that, in accordance with the various operations previously described herein, the ID of radius 1 is sent in the GVCU messages of all FACCH / SACCH, based on the granting of call. Next, in step 710, the radius 1 is connected. Then, in step 715, after the radio 2 is connected, the GVCU messages are updated to include the ID of the radio 2, based on the call granting in the site 2. Next, in step 720, in site 1, the GVCU of each SACCH non RA includes the ID of radius 2 and the GVCU of each SACCH of RA includes an ID = 0.

Fig. 8 is a flow diagram illustrating a method for interrupting the radio-to-radio audio at the same site 800, in accordance with some embodiments. As illustrated, the operation begins at step 805, at which the radius 1 is transmitting. It will be noted that the ID of radius 1 is transmitted in GVCU messages of all FACCH / SACCH based on the granting of call. Next, in step 810, the radius 2 is connected. For example, radio 2 can be connected to the control channel. Now, in step 815, the individual ID in the GVCU messages is updated based on the granting of the call. Then, in step 820, the BS issues an AC_RELEASE message towards the radius 1. In response, in step 825, radio 1 turns off its transmitter to avoid interfering with radio 2. Next, in step 830, the ID of the radius 2 is sent in the GVCU of the messages of the RA SACCH. In an alternative mode (not shown), the MAC_RELEASE and the GVCU could be sent with the ID of radius 2 in the same RA SACCH.

As those of skill in the art can observe, in any of the previously described scenarios, when the last radio has been disconnected in a call, the protocol data units (PDUs) MAC_HANGTIME are sent in the FACCH and the SACCH. The non-RA SACCH continues to send the call controller ID and the RA SACCH indicates ID = 0.

Figure 9 illustrates the sending 900 of random access control signals in the voice channel, in accordance with some modalities. As illustrated, a plurality of superframes 905-n supply the information of the signals within a speech channel. As previously mentioned in the present, each superframe 905-n contains 12 slots. The first 10 slots of each superframe, numbered 0 through 9, can be used for voice or signal information. If they are used for sending signals, they are called "associated fast control channel (FACCH)". The two The last slots of each superframe, numbered 10 and 11, can only be used to send signals from information and are called associated slow control channel or SACCH. A VCH is composed of 5 time slots of transit (voice + signals) or FACCH, followed by a signal time slot of the SACCH.

Inter-slot signal channels (ISCH) alternate within each superframe 905-n. For example, two I-ISCH (910 and 915) are alternated with two S-ISCH channels (920) interleaving between each slot of each superframe 905.

Each I-ISCH has the following format: 6 5 4 3 2 1 0 Channel No ISCH Loe F U / F Count (Number i e channel) C Ubic. i the ISCH) (U / F account) The ubeampo "Channel No." (channel number) provides the parity of the VCH channel in the physical channel (note: if a number is preceded by a%, the number will be taken as binary): •% 00: VCH Channel 0 ·% 01: VCH channel 1 •% 10: Value reserved for use with the four-slot TDMA •% 11: Value reserved for use with the four-slot TD A The subfield "ISCH Loe" (location of the ISCH sequence) provides the location of the ISCH sequence in the superframe: •% 00: First sequence I-ISCH of the superframe •% 01: Second sequence I-ISCH of the superframe •% 10: Third I-ISCH sequence of the superframe •% 11: Reserved The subfield "U / F Count" (U / F account) is a counter that provides the location of the current superframe within the ultraframe: •% 00: The current superframe is Ira. in the ultraframe •% 01: The current superframe is the 2nd. in the ultraframe •% 10: The current superframe is the 3rd. in the ultraframe •% 11: The current superframe is the last in the ultraframe Subfield F provides the listening SU (s) with an indication of the VCH's output path in order to know whether the next time slot of the input SACCH is free for access: • 0: The next SACCH input time slot is for caller access • 1: The next time slot of the SACCH input is for the access of the recipient When the channel is idle (pause time or unassigned), the FNE determines whether listening radios are allowed to use the input SACCH by proper setting of subfield F.

In each, superframe 905-n, the I-ISCH 910-n is presented before the slot 0, between the slots 0 and 1, between the slots 3 and 4, between the slots 4 and 5, between the slots 7 and 8. and between slots 8 and 9. The I-ISCH 910-n provides information as to whether random access is allowed or not in the F bits and provides information related to where the SACCH should be used as a random access SACCH or as a SACCH of non-random access. For example: · I-ISCH 910-n of superframe 0 puts the counter at "00", which indicates that bursts 10 and 11 of superframe 0 are used to control the non-random access SACCH.

• I-ISCH 910-1 of superframe 1 sets the counter to "01", which indicates that bursts 10 and 11 of superframe 1 are used to control the non-random access SACCH.

• I-ISCH 910-2 of superframe 2 puts the counter at "10", which indicates that bursts 10 and 11 of superframe 2 are used to control the non-random access SACCH.

• I-ISCH 910-3 of superframe 3 sets the counter to "11", which indicates that bursts 10 and 11 of superframe 3 are used to control the random access SACCH.

• The I-ISCH 910-4 of superframe 4 sets the counter to "00", which indicates that bursts 10 and 11 of superframe 4 are used to control the non-random access SACCH.

• The I-ISCH 910-5 of superframe 5 sets the counter to "01", which indicates that bursts 10 and 11 of superframe 5 are used to control the non-random access SACCH.

As described here, modalities are presented so that the FNE knows precisely when a radio transmitter will be transmitting in the SACCH and in which it will not, so that it can use this knowledge to determine the synchronization for the radio transmitting, thus as to properly apply the control messages sent from the radio. The FNE can also know the pattern of the outgoing SACCH to effectively send both the ID of the owner's general call and the allowed ID of the radio transmitter. This allows the receiving radios to obtain information about the ID of the incoming call and control the radio that is allowed to transmit on the input channel. On the other hand, modalities are presented for the radio transmitter to learn the SACCH pattern, either from the control channel or from the signal sending pattern of the ISCH, before starting to transmit. As soon as this is known, the radio will follow this pattern throughout the transmission / call. The radio transmitter can also verify that it is still allowed to transmit by searching the signal SACCH. Additionally, modalities are presented so that the receiving radios obtain the SACCH pattern from the control channel and from the I-ISCH. Once known, the receiving radios can effectively determine the ID information of the incoming call.

In the preceding specification, specific modalities have been described. However, any person having ordinary skill in the art will realize that various changes and modifications may be made without departing from the scope of the invention as set forth in the following claims. Accordingly, it should be considered that the specification and figures are rather illustrative rather than restrictive and that all such modifications are intended to be included in the scope of the teachings herein.

The benefits, advantages, solutions to the problems and any elements that may generate some benefit, advantage or solution that is presented or becomes more pronounced should not be interpreted as critical, necessary or essential characteristics or elements of any or all of the claims. The invention will be defined only by the appended claims which include any amendments made during the period in which this request is pending and all equivalents of said claims are issued.

In addition, in this document may be used relational terms, such as first and second, superior and inferior and the like, only to distinguish an entity or action of another entity or action without requiring or implying, necessarily, any relationship or real order of this type between said entities or actions. The intent of the terms "comprising", "comprising", "having", "having", "including", "including", "containing", "containing" or any other variant thereof is to cover Non-exclusive inclusion, such as, for example, a process, method, article or apparatus that includes, contains, includes, contains a set of elements, does not only include said elements, but may include other elements not explicitly enumerated or inherent to said process, method , article or device. The element preceded by the words "comprises a ...", "has a ...", "includes a ...", "contains a ..." does not prevent, without further restrictions, the existence of additional identical elements in the process, method, article or apparatus that comprises, has, includes or contains the element. The terms "a" and "an" are defined as one or more, unless otherwise stated herein. The terms "substantially", "essentially", "approximately", "around" or any other synonym thereof are defined as close, as understood by any person who has ordinary experience in the art and in a non-limiting modality, it is defined that the term is within 10%; in another modality, within 5%; in another modality, within 1%, and in another modality, within 0.5%. The term "coupled", as used herein, is defined as connected, although not necessarily directly and not necessarily mechanically. A device or structure that is "configured" in a certain way is configured at least in that form, although it can also be configured in non-enumerated forms.

It will be noted that some modalities may be comprised of one or more generic or specialized processors (or processing devices), such as microprocessors, digital signal processors, custom processors and field-programmable gate or FPGA arrays and unique program instructions stored (including both software and firmware) that control the processor (s) in order to start, along with certain non-processor circuits, some, most or all functions of the method and / or apparatus described herein . Alternatively, some or all of the functions could be carried out by means of a state machine that does not have stored program instructions or in one or more specific application integrated circuits or ASIC, "Application Specific Integrated Circuit". , in which, each function or some combinations of certain functions are executed as custom logic. Obviously, a combination of the two approaches could be used.

Additionally, one embodiment may be embodied in the form of a computer readable storage medium that has computer readable code stored thereon for programming a computer (e.g., containing a processor) to execute a method as described and claimed. at the moment. Examples of this type of computer-readable storage media include, but are not limited to, hard drives, CD-ROMs, an optical storage device, a magnetic storage device, a ROM (read only memory), a PROM. (programmable memory only read), an EPROM (memory only programmable and erasable reading), an EEPROM (memory only read programmable and erasable by electricity) and a USB memory. On the other hand, anyone with ordinary experience is expected, despite some potentially significant effort and many design options motivated, for example, by time available, current technology and economic considerations, when guided by the concepts and principles here exposed you can easily generate such software instructions, programs and IC with a minimum amount of experimentation.

The summary of the invention is provided to allow the reader to quickly determine the nature of the technical invention. It is presented with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. Additionally, in the previous detailed description it can be observed that several characteristics are grouped in several modalities in order to speed up the exposure. It should not be interpreted that this method reflects any intention that the claimed modalities require more particularities than those expressly stated in each claim.

Rather, as reflected in the following claims, the subject matter of the invention resides in a number smaller than that of all the features of a single described modality. Thus, the following claims are, in this way, incorporated in the detailed description, where each claim is located by itself as a subject claimed separately.

Claims (21)

NOVELTY OF THE INVENTION Having described the present invention, it is considered as a novelty and, therefore, the content of the following is claimed as property REIVI DICATIONS:

1. A method for supplying control signals to a group of wireless communication devices communicating through a voice channel, the method comprising: to control 3 of 4 and 1 of 4 associated slow control channels (SACCH), operate at least one fixed network equipment to: determining a pattern of time slots that includes the location of a first set of time slots and the location of a second set of time slots within the voice channel, using the information received in a message, and send as a signal the pattern of time slots to one or more wireless communication devices through the voice channel.

2. The method according to claim 1, characterized in that the voice channel works using a medium access control (MAC) standard of project 25 (P25) of the Association of Public Safety Officials (APCO) and because the message comprises at least one of a synchronization broadcast message of the control channel or the information in a channel of information signals between slots (I-ISCH).

3. The method according to claim 2, characterized in that the information received in the message comprises at least one of 1 of 4 of the time slot pattern or 3 of 4 of the time slot pattern.

4. The method according to claim 1, characterized in that: the first subset of time slots comprises time slots of signals of the associated slow control channel which is non-random access (SACCH not RA) and the second set of time slots comprises time slots of signals of the RA SACCH.

5. The method according to claim 4, characterized in that: the first subset of time slots further comprises 3 of 4 signal time slots of the associated slow control channel and the second subset of time slots further comprises 1 of 4 signal time slots of the associated slow control channel.

6. The method according to claim 5, further comprising: operating one of the wireless communication devices that communicate over the voice channel to determine 1 of 4 of the pattern of time slots of random access SACCH signals in a synchronization message received through a control channel when one of the wireless communication devices is a synchronized wireless communication device and operating that wireless communication device that communicates through the voice channel to determine one of 1 of 4 of the pattern of time slots of the random access SACCH signals of an I-ISCH when that wireless communication device is a communication device Wireless not synchronized.

7. The method according to claim 5 further comprising: operating said wireless communication device that communicates through the voice channel to determine 3 of 4 of the non-random access SACCH pattern of a synchronization broadcast message received by a control channel when that wireless communication device is a synchronized wireless communication device and operate that wireless communication device that communicates through the voice channel to determine three out of four of the SACCH pattern that is not random access of an I-ISCH when that wireless communication device is a wireless device. wireless communication not synchronized.

8. The method according to claim 1, characterized in that the pattern of time slots is sent as a signal at least before or during an active call.

9. The method according to claim 1, further comprising: transmitting a user signal of the group voice channel (GVCU) from a wireless communication device to the group of wireless communication devices; transmitting a radio ID of the wireless communication device within the first subset of time slots of the user signal of the group voice channel and transmitting a radio ID equal to zero within the second subset of time slots of the signal of user of the group voice channel at a destination site, and transmitting the radio ID of the wireless communication device within the first subset of time slots and the second set of time slots of the user signal of the group voice channel at a home site.

10. The method according to claim 9, characterized in that: the first subset of time slots comprises 3 of 4 signal time slots of the associated slow control channel and the second subset of time slots comprises 1 of 4 signal time slots of the associated slow control channel.

11. The method according to claim 9, further comprising: zero the radius ID in the second set of time slots at the origin site when the transmitting wireless communication device is disconnected.

12. The method according to claim 9, further comprising, before transmitting the user's signal of the group voice channel from the wireless communication device: provide a call grant to the wireless communication device that transmits and set the radio ID as the radio ID of the handshake wireless communication device for the user signals of the group voice channel.

13. The method according to claim 11, further comprising: connect a console to transmit on the voice channel and transmitting a console ID within the first subset of time slots of the user's voice of the group voice channel and transmitting an ID equal to zero within the second subset of time slots of the group voice channel user's signal.

14. The method according to claim 13, further comprising, before connecting the console: setting a radius ID in the signal of the user of the group voice channel to zero in one or more random access time slots in each of the plurality of destination sites.

15. The method according to claim 14, characterized in that the random access time slots comprise the random access SACCH.

16. The method according to claim 13, further comprising: connect one of the wireless communication devices to the voice channel and transmitting a radio ID of one of the wireless communication devices within the first subset of time slots of the group voice channel user's signal and transmitting an ID equal to zero within the second subset of time slots of the signal of the user of the group voice channel at the origin site.

17. The method according to claim 9, further comprising: indicate that a console is transmitting in a delivery call granting and populate each message of a plurality of GVCU messages with a console ID of the delivery call grant in the first subset of time slots in a source and destination site.

18. The method according to claim 17, further comprising: continue transmitting the radio ID of the wireless communication device of the GVCU at the origin site of the second set of time slots.

19. The method according to claim 9, further comprising: connect another wireless communication device to the voice channel; updating a plurality of messages to include an ID of the other wireless communication device at the site of the other wireless communication device; send a MAC_Release message in the next available time slot and updating the first subset of time slots of the group voice channel user's signal to include the ID of the other wireless communication device and a radio ID equal to zero within the second subset of time slots of the GVCU signal on the associated site of a wireless communication device that transmits.

20. The method according to claim 9, further comprising: connect another wireless communication device to the voice channel in the same place of the radio transmitter; updating a plurality of GVCU messages to include an ID of the other wireless communication device; send a MAC_Release message to the wireless communication device via a base station and updating the first subset of time slots and the second subset of time slots of the group voice channel user signal to include the ID of the other wireless communication device.

21. The method according to claim 9, further comprising: disconnecting the wireless communication device in response to receiving a radio ID from the other wireless communication device in the second subset of time slots. RES TIMEN OF THE INVENTION A method is presented for fixed network equipment (FNE) to control three of four and one of four of the pattern of the associated slow control channel (SACCH) in a voice channel linked to project 25 (P25) of the Association of civil servants of communications in public security (APCO). That this pattern is of knowledge of both the FNE and the radio allows unique information to be sent as a signal in each type of SACCH. In accordance with some modalities, an operation allows to control the floor (the entrance) as long as there is an independent exit (floor) (for example, console delivery). The operation provided also allows each radio to distinguish the outgoing floor control signals from the identification (ID) of the incoming call. Having the infrastructure, controlling the SACCH input pattern and communicating this to all the radios, makes the correct detection of the pattern transmitted from the radio more reliable.